We should have a test which builds with ProGuard enabled!

[jonpryor]

[jonathanpeppers]

@jonpryor the Desugar test does this: https://github.com/xamarin/xamarin-android/blob/4deec52e39ca4e83590263891d56cca1394d596e/src/Xamarin.Android.Build.Tasks/Tests/Xamarin.Android.Build.Tests/BuildTest.cs#L2994-L3000

This PR expands upon this test, which would help: #2158

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